1. From the Section on Stroke Diagnostics and Therapeutics, National Institute of Neurological Disorders and Stroke, Bethesda, MD (M.L., S.J.W., Z.N., J.G.M.); Department of Neurology and Neurotherapeutics, Seton/University of Texas Southwestern, Austin (S.J.W.); and Johns Hopkins Community Physicians, Bethesda, MD (Z.N., J.G.M.).